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The difference is that you are unlucky if you don't open at least one Aether Hub, while your odds are heavily stacked against opening a Mana Crypt

This creates 3 disruptions: Altergeist Hexstia negates 2 Spell/Trap Altergeist Silquitous bounces a card An alternative play is to add Altergeist Protocol from deck to hand in Step 10

Put each other card exiled this way on the bottom of your library in a random order

this card gains ATK equal to the Tributed monster's ATK, until the End Phase

Koala is perfect for a more consistent aggressive strategy, but keep in mind the self-damage can put you in a vulnerable spot if youre too low on Life cards